Model:GDSBPS
Use:The Back Pressure Shearbox (BPS) has the ability to perform direct shear tests with precise back pressure control, for the recreation and measurement of realistic slope failures.
Standard:GBT 50123-2019
Product Code : GDSBPS
The BPS range includes a saturated version (control of pore water pressure), an unsaturated version (control of both pore water and pore air pressure) and a dynamic version.
Key features | Benefits to the user |
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Internal loadcell: | Internal loadcell for shear and optionally normal force for load measurements as close to the sample as possible for greater accuracy. |
Optional low-cost version: | Low-cost version available which uses hanging weights for axial load. |
Rigid aluminium cell body: | To reduce system compliance. |
Unsaturated GDSBPS: | The unsaturated GDSBPS is based on a standard, saturated device but modified to allow the measurement and control of matric suction (the difference between the pore air and water pressures). |
Real-world situations to be modelled in the laboratory: | All versions allow the pore pressures within the sample to be controlled. The control of pore pressure during direct shear testing allows real-world situations to be modelled in the laboratory. |
Dimensions |
L= 875mm x W = 350mm |
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Displacement Accuracy |
<0.1% FSO |
Displacement Resolution |
axial = +/- 15mm, shear = +/- 25mm |
Power |
240V or 110V 50/60Hz single phase |
Resolution of Measurement and Control |
16 bit (± 25mm = ± 0.7μm(shear), ±10mm = ±0.3μm (axial) |
Sample Sizes |
75mm x 75mm (alternative sizes available on request) |